N(aryl)n(hydrocarbyl)-omega-(4-phenyl-4-piperidinocarbonylheteroamine) alkanoamide



United States Patent Oflice 3,334,106 N(ARYL)N(HYDROCARBYL) w (4 PHENYL- 4 PIPERIDINOCARBONYLHETEROAMINE) ALKANOAMIDE John H. Biel, Milwaukee, Wis., assignor to Aldrich Chemical Company, Inc., Milwaukee, Wis., a corporation of Wisconsin No Drawing. Filed Oct. 20, 1964, Ser. No. 408,453

Claims. (Cl. 260-294) This invention relates to novel compounds. More particularly, this invention relates to-novel compounds which possess valuable therapeutic utility as antiarrhythmic agents. 'In another aspect, this invention relates to a novel method of treating cardiac arrhythmia.

It is an object of this invention to provide a new class of therapeutic compounds. It is another object of the present invention to provide novel compounds having antiar-rhythmic activity. It is a further object of the present invention to provide a novel method of treating cardiac arrhythmia.

These and other objects which may appear as the specification proceeds are achieved by this invention which comprises the provision of compounds selected from the group consisting of compounds of the formula -Het and the pharmaceutically acceptable nontoxic salts thereof. In Formula I,

Het is a heterocyclic ring selected from the group consisting of pyrrolidino, piperidino, morpholino, N'- (lower)alkylpiperazino, N'-hydroxy(lower) alkylpiperazino, N'-hydroxypiperidino, imidazolino, 1,2,3,4-tetra- 3,334,106 Patented Aug. 1, 1967 The pharmaceutically acceptable nontoxic salts include the organic and inorganic monoand di-acid addition salts, e.g., those prepared from acids such as hydrochloric,

' sulfuric, sulfamic, tartaric, fumaric, hydrobromic, hydriodic, glycolic, citric, maleic, phosphoric, succinic, acetic, nitric and the like.

The term (lower)alkyl as used herein means both straight and branched chain alkyl radicals containing from 1 to '8 carbon atoms, e.g. methyl, ethyl, propyl, isopropyl,

. from 1 to 8 carbon atoms, e.g. ethenyl, allyl, l-propenyl,

' l-butenyl, '3-butenyl, Z-methyl-l-propenyl, S-pentenyl, 1-

hydroisoquinolino, 1,2,5,6 tetrahydropyridino, hexahexenyl, 7-octenyl, etc.

The term (lower)alkynyl as used herein means both straight and branched chain alkynyl radicals containing from 1 to 8 carbon atoms, e.g. ethinyl, propargyl, 1- butinyl, 2-butinyl, 1,l-dimethylpropargyl, l-pentinyl, 1- heptinyl, etc.

The term (lower) alkylene as used herein means both straight and branched chain alkylene radicals containing from 1 to 8 carbon atoms, e.g. methylene, ethylene, octylene, propylene, butylene, isobutylene, t-butylene, amylene, hexylene, Z-ethylhexylene, etc.

Similarly, where the term (lower) is used as part of the description of another group, e.g., (lower) alkoxy, it refers to the alkyl portion of such group which is therefore as described in connection with (lower)alkyl.

Preferred compounds of the present invention are those having the following formulae (III) R R I b-Het- III R -Q (IV) R R ll FiO-Het \N o R a Re v 3 1. 2 .3 Still more preferred compounds of the present invention are those having the following formulae (X) 31 I Het 5 n M CN N O O (vm) 1 1 Y O N 0 SII(IN R l-Hat I H L (XIV) R1 R1 o N 0 u O (IX) R Xvi R1 (I) /CH\ 7 CH=N t? Y b-N-R v H (XVII) R1 R2 ll C-N r Y-ii-N-R The compounds of this invention are valuable pharmaceutical agents. They exhibit antiarrhythmic activity which makes the compounds useful for the treatment of cardiac arrhythmia.

Tests of the compounds of the present invention for antiarrhythmic activity were carried out by administering the compounds in dosages of mg./kg.'intraperitoneally to experimental animals inwhich electrically-induced ventricular fibrillation could be induced. Prevention of the ventricular fibrillation by a test compound, for example, N-benzyl-B-(4-phenyl 4 pyrrolidinocarbonylpiperidino)propionam'ide hydrochloride, N-(Z-phenylcyclopropyl)-,3-(4-phenyl 4 pyrrolidinocarbonylpiperidino)propionamide hydrochloride, N-benzyl-fi-(4-phenyl-4-piperidinocarbonylpiperidino)propionamide hydrochloride, indicates that the compound is an antiarrhythmic agent.

The compounds of the present invention are prepared by contactinga piperidine of the formula (XVIII) R wherein Het, R and R are as defined above, with a haloor tosylalkanoic acid amide of the formula (XIX) H X-Y-C-N-IH 6 Some of the piperidines of Formula XVIII which ma be employed in this process are,

4-phenyl-4-pyrrolidinocarbonylpiperidine, 4-phenyl-4-morpholinocarbonylpiperidine, 4-phenyl-4-piperidinocarbonylpiperidine, 4-phenyl-4-N'-hydroxypiperidinocarbonylpiperidine, 4-phenyl-4-hexamethyleneiminocarbonylpiperidine, 4-phenyl-4-N-methylpiperazinocarbonylpiperidine, 4-2-chlorophenyl-4-pyrrolidinocarbonylpiperidine, 4-2-trifluoromethylphenyl-4-pyrrolidinocarbonylpiperidine, 4-4-ethoxyphenyl-4-pyrrolidinocarbonylpiperidine and 4-2-hydroxyphenyl-4-pyrrolidinocarbonylpiperidine.

Some of the haloor tosylalkanoic acid amides which may be employed in this reaction are,

N-benzyl-B-chloropropionamide, N-3 -trifluoromethylbenzyl-lB-chloropropionamide, N-4-ethoxybenzyl-B-chloropropionamide, N-2,6-dimethylbenzyl-B-chloropropionamide, N-3,4-methylenedioxybenzyl-B-chloropropionamide, N-3,4-dimethoXybenzyl-fl-chloropropionamide, N-4-methoXybenzyl-fi-chloropropionamide, N-4-chlorobenzyl-fl-chloropropionamide, N-Z-fluorobenzyl-fi-chloropropionamide, N-4-trifluoromethylbenzyl- 8-chloropropionamide, N-2-ethoXybenzyl-fi-chloropropionamide, N-2,4-dimethylbenzyl-B-chloropropionamide, N-3,4-dichlorobenzyl-fi-chloropropionamide, N-2,6-dimethoxybenzyl-;8-chloropropionamide, N-Z-trifluoromethylbenzyl-B-chloropropionamide, N-4-methylbenzyl-B-chloropropionamide,- N-phenethyl-/3-bromopropionamide, N-a-methylphenethyl-B-bromopropionamide, N-4-chlorophenethyl-B-bromopropionamide, N-4-dimethylsulfamylphenethyl-fi-bromopropionamide, N-4-phenoxyphenethyl-p-bromopropionamide, N-phenethyl-y-bromobutyramide, N-methyl-N-phenethyl-'y-bromobutyramide, N-propargyl-N-cinnamyl-v-bromobutyramide, N-cyclopropyl-N-phenethyl-'y-bromobutyramide, N-dimethallyl-N-phenethyl-y-bromobutyramide, N-phenethyl-fl-chlorobutyramide, N-phenethyl-y-bromocrotonamide, N-2-phenylcyclopropyl-B-chloropropionamide, N-2-4-trifluoromethylphenylcyclopropyl-B-chloropropionamide and N-2-(3,4-methylenedioxyphenyl)cyclopropyl-B-chloropropionamide.

Representative of the novel amides of this invention which may be obtained in the foregoing manner are N-benzyl-B-(4-phenyl-4-pyrrolidinocarbonylpiperidino) propionamide, N-benzyl-B-(4-phenyl-4-morpholinocarbonylpiperidino) propionamide, I N-(a-methylphenethyl)43-(4-phenyl-4-N'-methylpiperazinocarb onylpiperidino propionamide, N-phenethyl-B-(4-phenyl 4-1,2,3,4-tetrahydroisoquino linocarbonylpiperidino)propionamide, N-3,4methylenedioxyphenethyl-B-(4-pheny1-4-pyrrolidinocarbonylpiperidino)propionamide, N-3,4-dimethoxyphenethyl-[3-(4-phenyl-4-piperidinocarbonylpiperidino)propionamide, N-2,6-dimethylbenzyl-}3-(4-phenyl-4-1,2,3,4-tetrahydroisoquinolinocarbonylpiperidino)propionamide, N-4-trifluoromethylphenethyl-fl-(4-4-chlorophenyl-4-pyrrolidinocarbonylpiperidino propionamide and N-Z-phenylcyclopropyl-B-(4-phenyl-4-piperidinocarbony1- piperidino)propionamide.

The starting materials, i.e., the compounds of Formulae XVIH and XIX used in the process described herein are compounds which are either commercially available, wellknown in the art, or easily prepared in accordance with standard organic procedures previously described in the chemical literature. The starting piperidines of Formula XVIII are obtained by methods described in United States Patent No. 3,097,209 and British Patent No. 931,789. The starting haloor tosylalkanoic acid amides of Formula XIX are described in United States Patent Nos. 2,929,818, 2,937,180 and 3,124,586. The general reaction for preparing the novel compounds of this invention is also described in United States Patent Nos, 2,929,818, 2,937,180 and 3,124,586.

The compositions of this invention when administered orally or parenterally in an efiective amount are effective in the treatment of cardiac arrhythmia. The usual dosage is from to 200 mg./kg.; although lesser or greater quantities may be used.

The following examples are intended to illustrate the invention described herein without unduly restricting it.

EXAMPLE 1 Preparation of N-benzyl-fl-(4-phenyl-4-pyrrolidinm carbonylpiperidino propionamide 0 II/ I i ll CHmm-C-NH-CILQ A mixture of 4-phenyl-4-pyrrolidinocarbonylpiperidine (12.9 gm., 0.05 mol), N-benzyl-fl-chloropropionamide (9.85 gm., 0.05 mol), triethylamine (5.1 gm., 0.05 mol) and dimethylformamide (35 ml.) was stirred at 70 C. for 1.5 hours. The resulting viscous mixture was added to water (300 ml.) containing sodium hydroxide (2 gm., 0.05 mol). The product, N-benzyl-fi-(4-phenyl-4-pyrrolidinocarbonylpiperidino)propionamide, separated as a solid, having a melting point of 139-142 C.

EXAMPLE 2 Preparation of N-benzyl-fl-(4-phenyl-4-pyrr0lidinocarbonylpiperidino) propionamide hydrochloride The N benzyl-B-(4-phenyl 4 pyrrolidinocarbonylpiperidino)propionamide of Example 1 was dissolved in methylene chloride through which a stream of anhydrous hydrogen chloride was then passed. The solid salt was collected and recrystallized from a mixture of isopropanol-n-butanol. The purified salt, N-benzyl-fl-(4-phenyl- 4-pyrrolidinocarbonylpiperidino)propionamide hydrochloride weighed 7.2 gm., and had a melting point of 256- 258 C.

Analysis.-Calcd for C H ClN O C, 68.48; H, 7.52; N, 9.22; Cl, 7.78. Found: C, 68.12; H, 7.56; N, 8.98; Cl, 7.63.

EXAMPLE 3 Preparation of N-(2-phenylcyclopropyl)-fl-(4-phenyl-4- pyrrolidinocarbonylpiperidino) propionamide l HzCHz-C-NEEQ A mixture of 4-phenyl-4-pyrrolidinocarbonylpiperidine (9.5 gm., 0.034 mol), N-(2-phenylcyclopropyl)-;3-ch1oropropionamide (8.25 gm., 0.034 mol), triethylamine (3.7 gm., 0.037 mol) and dimethylformamide (30 ml.) was stirred and heated to 70 C. for 3 hours. When cool, the mixture was added to water containing sodium hydroxide. The free base which separated as an oil did not crystallize. It was separated from the water and dissolved in methylene chloride. This solution was dried over anhydrous p0- tassium carbonate giving the product, N-(2-phenylcyclopropyl)-fi-(4-phenyl 4 pyrrolidinocarbonylpiperidino) propionamide.

EXAMPLE 4 Preparation of N-(Z-phenylcyclopropyl) [3 (4-phenyl- 4-pyrrolidinocarbonylpiperidino) propionamide hydrochloride Preparation of N-benzyZ-;8-(4-phenyl-4-piperidinocarbonylpiperidino)propionamide A mixture of 4-phenyl-4-piperidinocarbonylpiperidine (14 gm., 0.05 mol), N-benzyl-;8-chloropropionamide (9.4 gm., 0.05 mol), triethylamine (5.2 gm., 0.05 mol), and anhydrous ethanol (50 ml.) was stirred and heated to a temperature of 70 C. for 4 hours. The mixture was cooled and poured into: water ml.) containing sodium hydroxide (2 gm., 0.05 mol). An oil formed which did not crystallize upon standing. The water layer was removed, and the base, N-benzyl-fi-(4-phenyl-4-piperidinooarbonylpiperidino)propionamide, collected in methylene chloride.

EXAMPLE 6 Preparation of NFbenzyl-fi-(4-phenyl-4-piperidinocarb0nylpiperidino)propionamide hydrochloride The free base, N-benzyl-B-(4-phenyl-4-piperidinocarbonylpiperidino)propionamide, dissolved in methylene chloride was treated with a stream of gaseous hydrogen chloride. The salt which separated was collected and purified by recrystallization from n-butanol. The pure salt, N benzyl fi-(4-phenyl-4-piperidinocarbonylpiperidino)propionamide hydrochloride, weighed 9.8 gm., and had a melting point of 24l.5242 C.

Analysis.-Calcd for C27H3 ClN3O2I C, 68.99, H, 7.72; N, 8.94; Cl, 7.54. Found: C, 68.91; H, 7.61; N, 10.98; Cl, 7.49.

EXAMPLE 7 When, in the procedure of Example 1, N-benzyl-flchloropropionamide is replaced by an equal molar amount of N-B-naphthyl-[S-chloropropionamide, N-a-naphthyl fl-chloropropionamide,

What is claimed is: 4. A compound having the formula" 1. A compound selected from the group consisting of compounds of the formula R1 R p o H i I et v O N o 1 --&NR "Pg-N wherein Het is a heterocyclic ring selected from the group consisting of pyrrolidino, piperidino, morpholino, N'- (lower)alkylpiperazino, N'-hydr-oxy(lower)alkylpiper- WhereinYiS Y 'lazino, N-hydroxypiperidino, imidazolino, 1,2,3,4-tet- A wmpound having t e. formula Y rahydroisoquinolino, 1,2,5,6-tetrahydropy1idino, hex- I amethyleneirnino; R and R are each a member selected from the group consisting of hydrogen, 'chloro, bromo, iodo, fluoro, trifluoromethyl, (1ower).alkyl, (lower)alkoxy, (lower)- alkylthio, di(1ower)alky1sulfamyl, phenyl, phenoxy, l] benzyl, and when taken together, methylenedioxy; R is a member selected from the group consisting of E] hydrogen, (lower) alkyl, (lower) alkenyl, (lower) alkynyl and cycloalkyl radicals having from 3 to 7 carbon atoms, inclusive;

0 R is a member selected from the group consisting of I II thienyl, pyridyl, pyrimidyl, isoxazolyl, thienyl(lower)- 'fi alkyl, pyridyl(lower)alkyl, naphthyl, Ph-, Ph-(lower)- alkyl, Ph-(lower)alkenyl and Ph-cyclopropyl, wherein Q Phis a radical of the formula o 40 wherein Y is (lower)alkylene. wherein R and R are each a member selected from The compound havmg the formula the group consisting of hydrogen, chloro, bromo, iodo, fluoro, trifluoromethyl, (lower) alkyl, (lower)alkoxy, (lower)alkylthio, di(lower)alkylsulfamyl, phenyl, phenoxy, benzyl, and when taken together, methylenedioxy; 0 Y is (lower) alkylene, I and the pharmaceutically acceptable nontoxic salts there- N l of. 2. A compound having the formula N o i tbmcm-ii-rr-om-Q 6-K H N O 7. The compound having the formula wherein Y is (lower)al-kylene.

3. A compound having the formula 0 wherein Y is (lower)-alkylene.

23 8. The compound having the formula 9. The compound having the formula 10. The compound having the formula N f? mom-c-g-om-Q-on References Cited UNITED 25 WALTER A. MODANCE, Primary Examiner.

A. D. SPEVACK, Assistant Examiner. 

1. A COMPOUND SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULA
 3. A COMPOUND HAVING THE FORMULA 